Battery end cover assembly, battery monomer, battery pack and power utilization device

Abstract

The utility model discloses a battery end cover assembly, a battery monomer, a battery pack and an electric device. The battery end cover assembly comprises an end cover and a sealing structure, a liquid injection hole is formed in the end cover, a first supporting table and a second supporting table are formed on the inner circumferential wall of the liquid injection hole, the sealing structure is installed in the liquid injection hole and comprises a sealing cover, the sealing cover comprises a cover body, a fixing part and a supporting part, the supporting part is connected between the cover body and the fixing part, and the fixing part is supported on the first supporting table and connected with the end cover. The supporting part is supported on the second supporting table, the supporting part comprises a contact section making contact with the second supporting table, and the sealing cover has the elastic deformation capacity in the radial direction of the liquid injection hole, so that the contact section can slide in the radial direction of the liquid injection hole along the second supporting table. According to the battery end cover assembly disclosed by the utility model, the assembly gap between the fixing part of the sealing cover and the inner peripheral wall of the liquid injection hole can be reduced, so that the sealing effect of the sealing structure on the liquid injection hole can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery end cover assembly, a battery monomer, a battery pack and an electrical device. Background Art

[0002] In the related art, a liquid injection hole is provided on the end cap of a battery cell. After the electrode assembly is installed in the battery housing, electrolyte is injected into the battery cell through the liquid injection hole. A sealing structure is then installed at the liquid injection hole to seal the liquid injection hole. Taking into account processing and assembly errors, to ensure that the sealing structure can be smoothly installed at the liquid injection hole, an assembly gap of approximately 0.2 mm is usually reserved between the outer peripheral wall of the sealing structure and the inner peripheral wall of the liquid injection hole. Due to the limitations of the sealing structure in the related art and the existence of the aforementioned large assembly gap, poor sealing can occur. Therefore, there is room for improvement. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a battery end cap assembly that, during assembly, can elastically deform the sealing cap along the radial direction of the liquid injection hole by pressing down on the main body of the sealing cap, causing the sealing cap to expand outward along the radial direction of the liquid injection hole, thereby reducing the assembly gap between the fixing portion of the sealing cap and the inner peripheral wall of the liquid injection hole, thereby improving the sealing effect of the sealing structure on the liquid injection hole.

[0004] The utility model also provides a battery monomer having the battery end cover assembly.

[0005] The utility model also provides a battery pack having the battery monomer.

[0006] The utility model also provides an electrical device having the battery pack.

[0007] According to an embodiment of the first aspect of the present invention, a battery end cap assembly includes: an end cap formed with a liquid injection hole, wherein the inner peripheral wall of the liquid injection hole is formed with a first support platform and a second support platform spaced apart along the axial direction of the liquid injection hole, the first support platform being located on a side of the second support platform close to the outer surface of the end cap, and the second support platform being located on a side of the first support platform close to the central axis of the liquid injection hole; a sealing structure installed on the liquid injection hole to seal the liquid injection hole, the sealing structure including a sealing cover, the sealing cover including a cover body, a fixing portion and a supporting portion, the supporting portion being connected to the outer peripheral side of the cover body and being annular and extending along the circumference of the liquid injection hole, the fixing portion being connected to the outer peripheral side of the supporting portion and being annular and extending along the circumference of the liquid injection hole, the fixing portion being supported by the first support platform and connected to the end cap, the supporting portion being supported by the second support platform, the supporting portion including a contact section that contacts the second support platform, and the sealing cover having elastic deformation ability in the radial direction of the liquid injection hole so that the contact section can slide along the second support platform in the radial direction of the liquid injection hole.

[0008] According to the battery end cover assembly of the embodiment of the present invention, the inner peripheral wall of the liquid injection hole is set to form a first support platform and a second support platform, and the sealing cover of the sealing structure is set to include a fixed part supported on the first support platform and a supporting part supported on the second support platform. In the process of installing the sealing structure to the liquid injection hole, the supporting part of the sealing cover can be supported on the second support platform and the sealing cover can be supported on the first support platform. By pressing down the cover body of the sealing cover, the sealing cover can be elastically deformed along the radial direction of the liquid injection hole, so that the contact section of the supporting part slides along the second support platform in the radial direction of the liquid injection hole, so that the sealing cover expands outward along the radial direction of the liquid injection hole, thereby reducing the assembly gap between the fixed part of the sealing cover and the inner peripheral wall of the liquid injection hole, thereby improving the sealing effect of the sealing structure on the liquid injection hole.

[0009] According to some embodiments of the present invention, the support portion has elastic deformation capability in the radial direction of the liquid injection hole, so that the contact section can slide in the radial direction of the liquid injection hole along the second support platform.

[0010] According to some embodiments of the present invention, the support portion includes a slope section, which is connected between the cover body and the contact section. The angle between the slope section and the cover body is variable so that the support portion has elastic deformation ability in the radial direction of the injection hole.

[0011] According to some embodiments of the present invention, when the fixing portion is not connected and fixed to the end cover, the angle between the slope section and the cover body is θ1; when the fixing portion is connected and fixed to the end cover, the angle between the slope section and the cover body is θ2, and θ2>θ1.

[0012] According to some embodiments of the present invention, when the fixing portion is not connected and fixed to the end cover, the angle between the slope section and the cover body is θ1, and θ1 satisfies: 90°<θ1<180°; when the fixing portion is connected and fixed to the end cover, the angle between the slope section and the cover body is θ2, and θ2 satisfies: 90°<θ2≤180°.

[0013] According to some embodiments of the present invention, the support portion is formed by a portion of the sealing cover being recessed toward an inner surface close to the end cover.

[0014] According to some embodiments of the present invention, the contact section is formed into an arc shape that bulges toward the second supporting platform.

[0015] According to some embodiments of the present invention, the dimension of the fixing portion in the radial direction of the liquid injection hole is W1, and the dimension of the first support platform in the radial direction of the liquid injection hole is W2, satisfying: W1>W2.

[0016] According to some embodiments of the present invention, W1 and W2 further satisfy: W1-W2≥0.1mm.

[0017] According to some embodiments of the present invention, the cover body is in the shape of a flat plate; and / or the fixing portion is in the shape of a flat plate.

[0018] According to some embodiments of the present invention, the outer surface of the end cover includes a first surface, the injection hole passes through the first surface, and the outer surface of the fixing portion is arranged flush with the first surface.

[0019] According to some embodiments of the present invention, the injection hole is formed as a stepped hole and includes a first hole segment, a second hole segment and a third hole segment arranged in sequence along the axial direction of the injection hole, the first hole segment passes through the outer surface of the end cover, the third hole segment passes through the inner surface of the end cover, the inner circumferential wall of the first hole segment is the first circumferential wall, the inner circumferential wall of the second hole segment is the second circumferential wall, the inner circumferential wall of the third hole segment is the third circumferential wall, the first support platform is connected between the first circumferential wall and the second circumferential wall, and the second support platform is connected between the second circumferential wall and the third circumferential wall.

[0020] According to some embodiments of the present invention, the sealing structure further includes a sealing column, which is located on the inner side of the sealing cover and connected to the sealing cover. The sealing column is an elastomer and has an interference fit with the liquid injection hole.

[0021] According to some embodiments of the present invention, the sealing cover is a metal part, and the sealing column is a plastic part or a rubber part; the sealing column and the sealing cover are injection molded or vulcanized into one piece.

[0022] According to some embodiments of the present invention, the fixing portion is connected to the end cover by welding; and / or the sealing cover is an integral stamped part.

[0023] The battery cell according to the second embodiment of the present invention includes: a battery housing, the battery housing including the battery end cover assembly according to the first embodiment of the present invention; and an electrode group disposed in the battery housing.

[0024] According to the battery cell of the embodiment of the present invention, by providing the above-mentioned battery end cover assembly, during the assembly process of the battery end cover assembly, by pressing down the cover body of the sealing cover, the sealing cover can be elastically deformed along the radial direction of the liquid injection hole, so that the sealing cover is expanded outward along the radial direction of the liquid injection hole, thereby reducing the assembly gap between the fixing portion of the sealing cover and the inner peripheral wall of the liquid injection hole, thereby improving the sealing effect of the sealing structure on the liquid injection hole.

[0025] A battery pack according to an embodiment of the third aspect of the present invention includes: a battery cell according to the embodiment of the second aspect of the present invention.

[0026] According to the battery pack of the embodiment of the present invention, by providing the above-mentioned battery cell, during the assembly process of the battery end cover assembly of the battery cell, by pressing down the cover body of the sealing cover, the sealing cover can be elastically deformed along the radial direction of the liquid injection hole, so that the sealing cover expands outward along the radial direction of the liquid injection hole, thereby reducing the assembly gap between the fixing portion of the sealing cover and the inner peripheral wall of the liquid injection hole, thereby improving the sealing effect of the sealing structure on the liquid injection hole.

[0027] According to the fourth embodiment of the present invention, the electrical device includes: the battery pack according to the third embodiment of the present invention, or includes the battery cell according to the second embodiment of the present invention.

[0028] According to the electrical device of the embodiment of the present invention, by setting the above-mentioned battery pack, the battery pack includes a battery cell. During the assembly process of the battery end cover assembly of the battery cell, by pressing down the cover body of the sealing cover, the sealing cover can be elastically deformed along the radial direction of the injection hole, so that the sealing cover expands outward along the radial direction of the injection hole, thereby reducing the assembly gap between the fixed part of the sealing cover and the inner peripheral wall of the injection hole, thereby improving the sealing effect of the sealing structure on the injection hole.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 is a perspective schematic diagram of a battery end cover assembly according to some embodiments of the present utility model;

[0032] Figure 2 yes Figure 1 Exploded view of the battery end cap assembly in FIG;

[0033] Figure 3 yes Figure 1 A cross-sectional view of a battery end cap assembly in FIG, wherein the sealing cap is fixedly connected to the end cap;

[0034] Figure 4 yes Figure 3 Schematic diagram of the assembly of the battery end cover assembly, wherein the sealing cover is not connected and fixed to the end cover;

[0035] Figure 5 is an exploded view of a battery end cover assembly according to other embodiments of the present invention;

[0036] Figure 6 yes Figure 5 Cross-sectional view of the battery end cover assembly in FIG.

[0037] Reference numerals:

[0038] 100. Battery end cover assembly;

[0039] 10. End cap; 101. Liquid injection hole; 11. First hole segment; 111. First peripheral wall; 12. Second hole segment; 121. Second peripheral wall; 13. Third hole segment; 131. Third peripheral wall; 14. First support platform; 141. First support surface; 15. Second support platform; 151. Second support surface; 16. First surface;

[0040] 20. Sealing structure; 21. Sealing cover; 211. Cover body; 212. Fixing portion; 213. Support portion; 214. Contact section; 215. Slope section; 22. Sealing column; 23. Assembly gap;

[0041] 30. Pole; 40. Explosion-proof valve. DETAILED DESCRIPTION

[0042] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0043] The battery end cover assembly 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0044] Reference Figures 1-6 According to the first embodiment of the present invention, a battery end cap assembly 100 includes an end cap 10 and a sealing structure 20. The end cap 10 is formed with a liquid injection hole 101, and the sealing structure 20 is installed in the liquid injection hole 101 to seal the liquid injection hole 101. The end cap 10 can be a metal part.

[0045] A first support platform 14 and a second support platform 15 are formed on the inner circumferential wall of the injection hole 101 and are spaced apart along the axial direction of the injection hole 101. The first support platform 14 is located on the side of the second support platform 15 close to the outer surface of the end cover 10, and the second support platform 15 is located on the side of the first support platform 14 close to the central axis s of the injection hole 101.

[0046] The sealing structure 20 includes a sealing cover 21, which can be a metal component. The sealing cover 21 includes a cover body 211, a fixing portion 212, and a support portion 213. The support portion 213 is connected to the outer periphery of the cover body 211 and is annular in shape, extending along the circumference of the liquid injection hole 101. The fixing portion 212 is connected to the outer periphery of the support portion 213 and is annular in shape, extending along the circumference of the liquid injection hole 101.

[0047] The fixing portion 212 is supported on the first support platform 14 and connected to the end cap 10. For example, the fixing portion 212 can be connected to the inner peripheral wall of the liquid injection hole 101. The supporting portion 213 is supported on the second support platform 15 and includes a contact section 214 that contacts the second support platform 15. The first support platform 14 has a first support surface 141, and the fixing portion 212 is supported on the first support surface 141 and abuts against the first support surface 141. The first support surface 141 can be a flat surface. The second support platform 15 has a second support surface 151, and the supporting portion 213 is supported on the second support surface 151 and abuts against the second support surface 151. The second support surface 151 can be a flat surface.

[0048] The sealing cover 21 has elastic deformation capability in the radial direction of the liquid injection hole 101, so that the contact section 214 can slide in the radial direction of the liquid injection hole 101 along the second support platform 15. During the process of installing the sealing structure 20 to the liquid injection hole 101, the support portion 213 of the sealing cover 21 can be supported on the second support platform 15 and the fixed portion 212 of the sealing cover 21 can be supported on the first support platform 14. By pressing down the cover body 211 of the sealing cover 21, the sealing cover 21 can be elastically deformed in the radial direction of the liquid injection hole 101, so that the contact section 214 of the support portion 213 slides in the radial direction of the liquid injection hole 101 along the second support platform 15, and the sealing cover 21 expands outward in the radial direction of the liquid injection hole 101, thereby reducing the assembly gap 23 between the fixed portion 212 of the sealing cover 21 and the inner peripheral wall of the liquid injection hole 101, thereby improving the sealing effect of the sealing structure 20 on the liquid injection hole 101.

[0049] The following briefly describes the assembly and connection process of the sealing structure 20 and the end cover 10 of the battery end cover assembly 100 according to the embodiment of the present invention.

[0050] First, place the sealing structure 20 at the injection hole 101 so that the fixing portion 212 of the sealing cover 21 is supported on the first support surface 141 of the first support platform 14 and the supporting portion 213 of the sealing cover 21 is supported on the second support surface 151 of the second support platform 15. Before connecting and fixing the sealing cover 21 to the end cover 10 (refer to Figure 4), the sealing cover 21 is pressed down, for example, by pressing down the cover body 211 of the sealing cover 21, so that the sealing cover 21 is elastically deformed in the radial direction of the liquid injection hole 101, so that the contact section 214 of the support portion 213 slides radially outward along the second support platform 15 in the radial direction of the liquid injection hole 101, so that the sealing cover 21 expands radially outward along the radial direction of the liquid injection hole 101, which can reduce the assembly gap 23 between the sealing cover 21 and the inner peripheral wall of the liquid injection hole 101. For example, the assembly gap 23 between the sealing cover 21 and the inner peripheral wall of the liquid injection hole 101 can be reduced from 0.2 mm to 0.05 mm or even less than 0.05 mm, which can effectively improve the sealing effect of the sealing structure 20 on the liquid injection hole 101.

[0051] When the assembly gap 23 between the sealing cap 21 and the inner circumferential wall of the liquid injection hole 101 is reduced to within a set range, the sealing cap 21 can be connected and fixed to the end cap 10. During this process, the sealing cap 21 remains pressed downward. In this way, during the process of connecting and fixing the sealing cap 21 to the end cap 10, the assembly gap 23 between the outer circumferential wall of the sealing cap 21 and the inner circumferential wall of the liquid injection hole 101 is smaller, which can improve the sealing effect of the sealing structure 20 on the liquid injection hole 101.

[0052] After the sealing cover 21 is connected and fixed to the end cover 10 (refer to Figure 3 ), and then remove the downward pressure applied to the sealing cover 21. Since the sealing cover 21 is fixed, the elastically deformed sealing cover 21 is fixed in the deformed state and will not return to its original state. If the sealing cover 21 and the end cover 10 are released from the connection and fixing relationship, the sealing cover 21 can basically return to its original state.

[0053] Optionally, the fixing portion 212 can be welded to the end cap 10. For example, the fixing portion 212 can be welded to the inner circumferential wall of the liquid injection hole 101. Since the assembly gap between the fixing portion 212 and the inner circumferential wall of the liquid injection hole 101 is reduced, the possibility of poor welding seals caused by a large assembly gap can be reduced. Furthermore, since the sealing cover 21 has elastic deformation ability and can absorb thermal deformation during the welding process, the impact of the initial welding position on the subsequent welding position can be reduced, and the welding end will not cause poor sealing due to deformation of the sealing cover 21 caused by welding heat.

[0054] Optionally, the sealing cover 21 is an integral stamped part, which allows the sealing cover 21 to be easily processed into a predetermined shape.

[0055] Optionally, the battery end cap assembly 100 may include a terminal post 30, which is provided on the end cap 10. For example, the end cap 10 is provided with a terminal post hole, and the terminal post 30 is installed in the terminal post hole. An insulating layer may be provided between the terminal post 30 and the end cap 10. There are two terminals 30, one of which is a positive electrode and the other is a negative electrode. The injection hole 101 may be located between the two terminals 30.

[0056] Optionally, the battery end cap assembly 100 may include an explosion-proof valve 40 , which is provided on the end cap 10 .

[0057] Optionally, the battery end cover assembly 100 includes the above-mentioned pole 30 and explosion-proof valve 40 , and the explosion-proof valve 40 and the injection hole 101 are both located between the two poles 30 , and the explosion-proof valve 40 and the injection hole 101 can be arranged along the arrangement direction of the two poles 30 .

[0058] According to the battery end cover assembly 100 of the embodiment of the present invention, the inner peripheral wall of the liquid injection hole 101 is provided to form the first support platform 14 and the second support platform 15, and the sealing cover 21 of the sealing structure 20 is provided to include a fixing portion 212 supported on the first support platform 14 and a supporting portion 213 supported on the second support platform 15. In the process of installing the sealing structure 20 to the liquid injection hole 101, the supporting portion 213 of the sealing cover 21 can be supported on the second support platform 15 and the sealing cover 21 can be supported on the first support platform 14. The support platform 14 can make the sealing cover 21 elastically deform along the radial direction of the liquid injection hole 101 by pressing down the cover body 211 of the sealing cover 21, so that the contact section 214 of the support portion 213 slides in the radial direction of the liquid injection hole 101 along the second support platform 15, so that the sealing cover 21 expands outward along the radial direction of the liquid injection hole 101, thereby reducing the assembly gap between the fixing portion 212 of the sealing cover 21 and the inner peripheral wall of the liquid injection hole 101, thereby improving the sealing effect of the sealing structure 20 for the liquid injection hole 101.

[0059] According to some embodiments of the present invention, referring to Figure 3 、 Figure 4 and Figure 6 The support portion 213 has elastic deformation capability in the radial direction of the liquid injection hole 101, so that the contact section 214 can slide in the radial direction of the liquid injection hole 101 along the second support platform 15. By making the support portion 213 of the sealing cover 21 elastically deformable in the radial direction of the liquid injection hole 101, since the support portion 213 is supported on the second support platform 15 of the end cover 10 via the contact section, before the sealing cover 21 is connected and fixed to the end cover 10, the support portion 213 can be more easily elastically deformed by virtue of the supporting force on the second support platform 15, and the deformation process is more stable and controllable.

[0060] According to some embodiments of the present invention, referring to Figure 3 、 Figure 4 and Figure 6 The support portion 213 includes a slope section 215, which is connected between the cover body 211 and the contact section 214. The angle between the slope section 215 and the cover body 211 is variable, so that the support portion 213 has elastic deformation ability in the radial direction of the injection hole 101. In the process of installing the sealing structure 20 to the injection hole 101, the support portion 213 of the sealing cover 21 can be supported on the second support platform 15 and the sealing cover 21 can be supported on the first support platform 14. By pressing down the cover body 211 of the sealing cover 21, the angle between the slope section 215 and the cover body 211 becomes larger, and the inclination angle of the slope section 215 decreases. The pressure on the cover body 211 is decomposed into two components along the axial direction of the injection hole 101 and along the radial direction of the injection hole 101 through the slope section 215. Among them, the component along the axial direction of the injection hole 101 makes the contact of the support portion 213 The contact segment 214 is pressed against the second support platform 15, and the radial component of the force along the liquid injection hole 101 causes the sealing cover 21 to have a tendency to expand in the radial direction of the liquid injection hole 101. Under the action of the radial component of the force along the liquid injection hole 101, the support portion 213 is elastically deformed, and the contact segment 214 of the support portion 213 is easy to slide on the second support platform 15 along the radial direction of the liquid injection hole 101 and toward the radial outside, thereby reducing the assembly gap between the fixing portion 212 of the sealing cover 21 and the inner peripheral wall of the liquid injection hole 101, thereby improving the sealing effect of the sealing structure 20 for the liquid injection hole 101.

[0061] According to some embodiments of the present invention, referring to Figure 3 and Figure 4 When the fixing portion 212 is not connected and fixed to the end cover 10, the angle between the slope section 215 and the cover body 211 is θ1. When the fixing portion 212 is connected and fixed to the end cover 10, the angle between the slope section 215 and the cover body 211 is θ2, and θ2>θ1. In this way, during the installation of the sealing cover 21 and before the sealing cover 21 is connected and fixed, by pressing the cover body 211 of the sealing cover 21, the slope section 215 can be deformed, the angle between the slope section 215 and the cover body 211 increases, the radial dimension of the sealing cover 21 increases, and the contact section 214 slides on the second support platform 15 along the radial direction of the liquid injection hole 101 and toward the radial outside, thereby reducing the assembly gap between the fixing portion 212 of the sealing cover 21 and the inner peripheral wall of the liquid injection hole 101.

[0062] According to some embodiments of the present invention, referring to Figure 3 and Figure 4When the fixing portion 212 is not connected and fixed to the end cover 10, the angle between the slope section 215 and the cover body 211 is θ1, and θ1 satisfies: 90°<θ1<180°; when the fixing portion 212 is connected and fixed to the end cover 10, the angle between the slope section 215 and the cover body 211 is θ2, and θ2 satisfies: 90°<θ2≤180°. When the fixing portion 212 is not connected and fixed to the end cover 10, the angle θ1 between the slope section 215 and the cover body 211 satisfies: 90°<θ1<180°. In the process of installing the sealing structure 20 to the liquid injection hole 101, by pressing down the cover body 211 of the sealing cover 21, the pressure on the cover body 211 can be decomposed into two components along the axial direction of the liquid injection hole 101 and the radial direction of the liquid injection hole 101 through the slope section 215; when the fixing portion 212 is connected and fixed to the end cover 10, the angle θ2 between the slope section 215 and the cover body 211 satisfies: 90°<θ2≤180°, wherein when θ2 is 180°, the slope section 215 can be set flush with the cover body 211.

[0063] According to some embodiments of the present invention, referring to Figure 3 、 Figure 4 and Figure 6 The support portion 213 is formed by recessing the portion of the sealing cover 21 toward the inner surface of the end cap 10. This simplifies the structure of the support portion 213 and facilitates its processing and molding. It also allows the support portion 213 to be more easily elastically deformed. Furthermore, during the welding process between the sealing cover 21 and the end cap 10, the support portion 213 can effectively absorb thermal deformation during the welding process. For example, the support portion 213 can be formed by stamping.

[0064] According to some embodiments of the present invention, referring to Figure 3 、 Figure 4 and Figure 6 The contact section 214 is formed into an arc shape that bulges toward the second support platform 15. Thus, the contact area between the contact section 214 and the second support platform 15 can be reduced. During the installation of the sealing structure 20 to the liquid injection hole 101, the support portion 213 of the sealing cover 21 can be supported on the second support platform 15, and the fixing portion 212 of the sealing cover 21 can be supported on the first support platform 14. When the cover body 211 of the sealing cover 21 is pressed downward, the friction between the contact section 214 of the support portion 213 and the second support platform 15 is reduced, thereby allowing the contact section 214 of the support portion 213 to slide relatively easily along the second support platform 15 in the radial direction of the liquid injection hole 101.

[0065] According to some embodiments of the present invention, referring to Figure 3 and Figure 6The dimension of the fixing portion 212 in the radial direction of the liquid injection hole 101 is W1, and the dimension of the first support platform 14 in the radial direction of the liquid injection hole 101 is W2, satisfying the following: W1>W2. By making the dimension of the fixing portion 212 in the radial direction of the liquid injection hole 101 larger than the dimension of the first support platform 14 in the radial direction of the liquid injection hole 101, during the assembly of the sealing structure 20, when the cover body 211 is pressed down to allow the contact section 214 of the support portion 213 to slide along the second support platform 15 in the radial direction of the liquid injection hole 101, the fixing portion 212 slides along the first support platform 14 in the radial direction of the liquid injection hole 101, ensuring that the contact section 214 always maintains contact with the second support platform 15, thereby effectively ensuring smooth radial outward sliding of the contact section 214, thereby reducing the assembly gap between the fixing portion 212 of the sealing cover 21 and the inner peripheral wall of the liquid injection hole 101.

[0066] According to some embodiments of the present invention, W1 and W2 further satisfy the following relationship: W1-W2 ≥ 0.1 mm. By ensuring that the difference between the radial dimension of the fixing portion 212 and the radial dimension of the first support platform 14 in the liquid injection hole 101 is no less than 0.1 mm, smooth radial outward sliding of the contact section 214 can be further effectively ensured, thereby reducing the assembly clearance between the fixing portion 212 of the sealing cover 21 and the inner peripheral wall of the liquid injection hole 101.

[0067] According to some embodiments of the present invention, referring to Figure 3 and Figure 6 The cover body 211 is in a flat plate shape. By setting the cover body 211 in a flat plate shape, the structure of the cover body 211 is simplified and the difficulty of processing and forming is reduced.

[0068] According to some embodiments of the present invention, referring to Figure 3 and Figure 6 The fixing portion 212 is flat. By setting the fixing portion 212 in a flat shape, the structure of the fixing portion 212 is simplified, reducing the difficulty of processing and forming. In addition, the contact area between the fixing portion 212 and the first support platform 14 can be increased, thereby improving the sealing effect.

[0069] According to some embodiments of the present invention, referring to Figure 3 and Figure 6 The outer surface of the end cap 10 includes a first surface 16, the injection hole 101 passes through the first surface 16, and the outer surface of the fixing portion 212 is flush with the first surface 16 of the end cap 10. By making the outer surface of the fixing portion 212 flush with the first surface 16 of the end cap 10, the additional space outside the end cap 10 occupied by the fixing portion 212 can be reduced, making the structure compact.

[0070] According to some embodiments of the present invention, referring to Figure 3 and Figure 6 The injection hole 101 is formed as a stepped hole and includes a first hole segment 11, a second hole segment 12, and a third hole segment 13 arranged in sequence along the axial direction of the injection hole 101. The first hole segment 11 passes through the outer surface of the end cover 10, and the third hole segment 13 passes through the inner surface of the end cover 10. The inner peripheral wall of the first hole segment 11 is a first peripheral wall 111, the inner peripheral wall of the second hole segment 12 is a second peripheral wall 121, and the inner peripheral wall of the third hole segment 13 is a third peripheral wall 131. The first support platform 14 is connected between the first peripheral wall 111 and the second peripheral wall 121, and the second support platform 15 is connected between the second peripheral wall 121 and the third peripheral wall 131. By configuring the injection hole 101 as a stepped hole, the above-mentioned first support platform 14 and second support platform 15 can be conveniently formed.

[0071] According to some embodiments of the present invention, referring to Figure 5-Figure 6 The sealing structure 20 further includes a sealing column 22, which is located on the inner side of the sealing cover 21 and connected to the sealing cover 21. The sealing column 22 is an elastic body and has an interference fit with the injection hole 101. By including the sealing column 22 disposed on the inner side of the sealing cover 21 in the sealing structure 20, the sealing effect of the sealing structure 20 on the injection hole 101 can be further improved. In addition, the sealing column 22 is an elastic body, which can increase the elastic deformation ability of the sealing column 22 and enable the sealing column 22 to have an interference fit with the injection hole 101. For example, the sealing column 22 has an interference fit with the third hole section 13 of the injection hole 101, which can further improve the sealing effect.

[0072] In an embodiment in which the sealing structure 20 includes a sealing column 22, during the process of installing the sealing structure 20 to the liquid injection hole 101, the sealing structure 20 can be inserted into the liquid injection hole 101 so that the sealing column 22 is accommodated in the liquid injection hole 101, the supporting portion 213 of the sealing cover 21 can be supported on the second support platform 15 and the fixing portion 212 of the sealing cover 21 can be supported on the first support platform 14. By pressing down the cover body 211 of the sealing cover 21, the sealing column 22 can be elastically deformed and compressed downward. At the same time, the sealing cover 21 can be elastically deformed along the radial direction of the liquid injection hole 101, so that the contact section 214 of the supporting portion 213 slides along the second support platform 15 in the radial direction of the liquid injection hole 101, so that the sealing cover 21 expands outward along the radial direction of the liquid injection hole 101, thereby reducing the assembly gap between the fixing portion 212 of the sealing cover 21 and the inner circumferential wall of the liquid injection hole 101, thereby improving the sealing effect of the sealing structure 20 for the liquid injection hole 101.

[0073] In addition, when the sealing column 22 is connected to the cover body 211 and the slope section 215 of the support portion 213, during the process of installing the sealing structure 20 to the liquid injection hole 101, the sealing structure 20 can be inserted into the liquid injection hole 101, so that the sealing column 22 is accommodated in the liquid injection hole 101, and the support portion 213 of the sealing cover 21 can be supported on the second support platform 15 and the fixing portion 212 of the sealing cover 21 can be supported on the first support platform 14. By pressing down the cover body 211 of the sealing cover 21, the sealing column 22 can be elastically deformed and compressed downward, and at the same time, the sealing cover 21 can be elastically deformed along the radial direction of the liquid injection hole 101. , so that the contact section 214 of the support portion 213 slides along the second support platform 15 in the radial direction of the liquid injection hole 101. During the process of the contact section 214 of the support portion 213 sliding along the second support platform 15 in the radial direction of the liquid injection hole 101, the support portion 213 can pull the sealing column 22, so that the sealing column 22 is elastically deformed and stretched radially along the radial direction of the liquid injection hole 101, so that the sealing cover 21 expands outward along the radial direction of the liquid injection hole 101, thereby reducing the assembly gap between the fixing portion 212 of the sealing cover 21 and the inner peripheral wall of the liquid injection hole 101, thereby improving the sealing effect of the sealing structure 20 for the liquid injection hole 101.

[0074] According to some embodiments of the present invention, the sealing cover 21 is a metal part, the sealing column 22 is a plastic part or a rubber part, and the sealing column 22 has an interference fit with the injection hole 101. By configuring the sealing cover 21 as a metal part, the structural strength of the sealing structure 20 is ensured, and the connection and fixation between the sealing cover 21 and the end cover 10 are facilitated; and by configuring the sealing column 22 as a plastic part or a rubber part, the elastic deformation ability of the sealing column 22 can be enhanced, and the sealing column 22 can have an interference fit with the injection hole 101, for example, the sealing column 22 has an interference fit with the third hole section 13 of the injection hole 101, which can further improve the sealing effect.

[0075] According to some embodiments of the present invention, the sealing column 22 is integrally molded or vulcanized with the sealing cover 21. This allows the sealing column 22 and the sealing cover 21 to be integrally connected, thereby improving the stability and reliability of the connection between the sealing cover 21 and the sealing column 22 and eliminating the need for an additional assembly process between the sealing column 22 and the sealing cover 21.

[0076] The battery cell according to the second embodiment of the present invention includes: a battery shell and an electrode group. The battery shell includes the battery end cover assembly 100 according to the first embodiment of the present invention. The electrode group is arranged in the battery shell and includes a positive electrode sheet and a negative electrode sheet.

[0077] According to the battery cell of the embodiment of the present invention, by providing the above-mentioned battery end cover assembly 100, during the assembly process of the battery end cover assembly 100, by pressing down the cover body 211 of the sealing cover 21, the sealing cover 21 can be elastically deformed along the radial direction of the liquid injection hole 101, so that the sealing cover 21 expands outward along the radial direction of the liquid injection hole 101, thereby reducing the assembly gap between the fixing portion 212 of the sealing cover 21 and the inner peripheral wall of the liquid injection hole 101, thereby improving the sealing effect of the sealing structure 20 for the liquid injection hole 101.

[0078] A battery pack according to an embodiment of the third aspect of the present invention includes: a battery cell according to the embodiment of the second aspect of the present invention.

[0079] According to the battery pack of the embodiment of the present invention, by providing the above-mentioned battery cell, during the assembly process of the battery end cover assembly 100 of the battery cell, by pressing down the cover body 211 of the sealing cover 21, the sealing cover 21 can be elastically deformed along the radial direction of the liquid injection hole 101, so that the sealing cover 21 expands outward along the radial direction of the liquid injection hole 101, thereby reducing the assembly gap between the fixing portion 212 of the sealing cover 21 and the inner peripheral wall of the liquid injection hole 101, thereby improving the sealing effect of the sealing structure 20 for the liquid injection hole 101.

[0080] According to the fourth embodiment of the present invention, the electrical device includes: the battery pack according to the third embodiment of the present invention, or includes the battery cell according to the second embodiment of the present invention.

[0081] The electrical device may be a vehicle, and the battery pack provides power for the vehicle.

[0082] According to the electrical device of the embodiment of the present invention, by setting the above-mentioned battery pack, the battery pack includes a battery cell. During the assembly process of the battery end cover assembly 100 of the battery cell, by pressing down the cover body 211 of the sealing cover 21, the sealing cover 21 can be elastically deformed along the radial direction of the liquid injection hole 101, so that the sealing cover 21 expands outward along the radial direction of the liquid injection hole 101, thereby reducing the assembly gap between the fixing portion 212 of the sealing cover 21 and the inner peripheral wall of the liquid injection hole 101, thereby improving the sealing effect of the sealing structure 20 for the liquid injection hole 101.

[0083] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0084] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery end cap assembly, characterized in that: include: an end cap having a liquid injection hole formed therein, wherein a first support platform and a second support platform are formed on an inner peripheral wall of the liquid injection hole and are spaced apart along the axial direction of the liquid injection hole, wherein the first support platform is located on a side of the second support platform close to the outer surface of the end cap, and the second support platform is located on a side of the first support platform close to the central axis of the liquid injection hole; A sealing structure is installed on the injection hole to seal the injection hole, and the sealing structure includes a sealing cover, and the sealing cover includes a cover body, a fixing part and a supporting part, the supporting part is connected to the outer peripheral side of the cover body and is annular and extends along the circumference of the injection hole, the fixing part is connected to the outer peripheral side of the supporting part and is annular and extends along the circumference of the injection hole, the fixing part is supported on the first supporting platform and connected to the end cover, the supporting part is supported on the second supporting platform, the supporting part includes a contact section that contacts the second supporting platform, and the sealing cover has elastic deformation ability in the radial direction of the injection hole, so that the contact section can slide along the second supporting platform in the radial direction of the injection hole.

2. The battery end cap assembly according to claim 1, wherein: The support portion has elastic deformation capability in the radial direction of the liquid injection hole, so that the contact section can slide along the second support platform in the radial direction of the liquid injection hole.

3. The battery end cap assembly according to claim 2, wherein: The support portion includes a slope section connected between the cover body and the contact section. The angle between the slope section and the cover body is variable, so that the support portion has elastic deformation capability in the radial direction of the liquid injection hole.

4. The battery end cap assembly according to claim 3, wherein: When the fixing portion is not connected and fixed to the end cover, the angle between the slope section and the cover body is θ1. When the fixing portion is connected and fixed to the end cover, the angle between the slope section and the cover body is θ2, and θ2>θ1.

5. The battery end cap assembly according to claim 4, wherein: The angle θ1 satisfies: 90°<θ1<180°; the angle θ2 satisfies: 90°<θ2≤180°.

6. The battery end cap assembly according to claim 1, wherein: The supporting portion is formed by a portion of the sealing cover being recessed toward a direction close to the inner surface of the end cover.

7. The battery end cover assembly according to any one of claims 1 to 6, characterized in that: The contact section is formed in an arc shape that bulges toward the second supporting platform.

8. The battery end cover assembly according to any one of claims 1 to 6, characterized in that: The dimension of the fixing portion in the radial direction of the liquid injection hole is W1, and the dimension of the first support platform in the radial direction of the liquid injection hole is W2, which satisfies: W1>W2.

9. The battery end cap assembly according to claim 8, wherein: The W1 and W2 further satisfy: W1-W2≥0.1mm.

10. The battery end cover assembly according to any one of claims 1 to 6, characterized in that: The cover body is in the shape of a flat plate; and / or the fixing portion is in the shape of a flat plate.

11. The battery end cover assembly according to any one of claims 1 to 6, characterized in that: The outer surface of the end cover includes a first surface, the injection hole passes through the first surface, and the outer surface of the fixing portion is arranged flush with the first surface.

12. The battery end cap assembly according to any one of claims 1 to 6, characterized in that: The injection hole is formed as a stepped hole and includes a first hole segment, a second hole segment and a third hole segment arranged in sequence along the axial direction of the injection hole, the first hole segment passes through the outer surface of the end cover, the third hole segment passes through the inner surface of the end cover, the inner circumferential wall of the first hole segment is the first circumferential wall, the inner circumferential wall of the second hole segment is the second circumferential wall, and the inner circumferential wall of the third hole segment is the third circumferential wall, the first support platform is connected between the first circumferential wall and the second circumferential wall, the second support platform is connected between the second circumferential wall and the third circumferential wall, and the fixing portion is connected to the first circumferential wall.

13. The battery end cap assembly according to any one of claims 1 to 6, characterized in that: The sealing structure further includes a sealing column, which is located on the inner side of the sealing cover and connected to the sealing cover. The sealing column is an elastic body and has an interference fit with the liquid injection hole.

14. The battery end cap assembly according to claim 13, wherein: The sealing cover is a metal part, and the sealing column is a plastic part or a rubber part; the sealing column and the sealing cover are integrally formed by injection molding or vulcanization.

15. The battery end cover assembly according to any one of claims 1 to 6, characterized in that: The fixing portion is welded to the end cover; and / or the sealing cover is an integral stamped part.

16. A battery cell, characterized in that: include: A battery housing, comprising a battery end cap assembly according to any one of claims 1 to 15; The electrode group is arranged in the battery shell.

17. A battery pack, characterized in that: include: The battery cell according to claim 16.

18. An electrical device, characterized in that: include: The battery pack according to claim 17, or comprising the battery cell according to claim 16.

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